It is a common GM switch, since we have GM steering columns in our older XJs. You can get a replacement at the dealer (surprise!) or at a car parts chain-store in the Help line of products. They are available with or without the cruise control function, be sure you get the one you want. Now changing them is an interesting exercise.......I'm putting off changing the one in my daughter's 1990 XJ. When the cruise quit it was no big deal, but now the signals have quit (but 4-ways work, so it's the switch) I have to get on with it. You need a spring-plate depressor and the lock ring tool, then a manual to deal with all the parts. There are a bunch of really fine wires that eventually break from flexing many times.